20406832 has 20 divisors (see below), whose sum is σ = 40608016. Its totient is φ = 9927360.

The previous prime is 20406829. The next prime is 20406833. The reversal of 20406832 is 23860402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20406797 and 20406806.

It is not an unprimeable number, because it can be changed into a prime (20406833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16644 + ... + 17827.

Almost surely, 2^20406832 is an apocalyptic number.

It is an amenable number.

20406832 is a deficient number, since it is larger than the sum of its proper divisors (20201184).

20406832 is a wasteful number, since it uses less digits than its factorization.

20406832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34516 (or 34510 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20406832 is about 4517.3921680545. The cubic root of 20406832 is about 273.2699410132.

The spelling of 20406832 in words is "twenty million, four hundred six thousand, eight hundred thirty-two".